From: Peter Chen <peter.chen@nxp.com>
To: Philippe Schenker <philippe.schenker@toradex.com>
Cc: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
Stefan Agner <stefan.agner@toradex.com>,
Marcel Ziswiler <marcel.ziswiler@toradex.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] usb: chipidea: fix ci_irq for role-switching use-case
Date: Mon, 29 Jun 2020 07:26:41 +0000 [thread overview]
Message-ID: <20200629072703.GC30684@b29397-desktop> (raw)
In-Reply-To: <20200626110311.221596-1-philippe.schenker@toradex.com>
On 20-06-26 13:03:11, Philippe Schenker wrote:
> If the hardware is in low-power-mode and one plugs in device or host
> it did not switch the mode due to the early exit out of the interrupt.
Do you mean there is no coming call for role-switch? Could you please share
your dts changes? Try below patch:
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index e8ce300ad490..9e10dcfeb98f 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -1313,6 +1313,29 @@ static void ci_controller_suspend(struct ci_hdrc *ci)
enable_irq(ci->irq);
}
+/*
+ * Handle the wakeup interrupt triggered by extcon connector
+ * We need to call ci_irq again for extcon since the first
+ * interrupt (wakeup int) only let the controller be out of
+ * low power mode, but not handle any interrupts.
+ */
+static void ci_extcon_wakeup_int(struct ci_hdrc *ci)
+{
+ struct ci_hdrc_cable *cable_id, *cable_vbus;
+ u32 otgsc = hw_read_otgsc(ci, ~0);
+
+ cable_id = &ci->platdata->id_extcon;
+ cable_vbus = &ci->platdata->vbus_extcon;
+
+ if (!IS_ERR(cable_id->edev) && ci->is_otg &&
+ (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS))
+ ci_irq(ci->irq, ci);
+
+ if (!IS_ERR(cable_vbus->edev) && ci->is_otg &&
+ (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS))
+ ci_irq(ci->irq, ci);
+}
+
static int ci_controller_resume(struct device *dev)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
@@ -1343,6 +1366,7 @@ static int ci_controller_resume(struct device *dev)
enable_irq(ci->irq);
if (ci_otg_is_fsm_mode(ci))
ci_otg_fsm_wakeup_by_srp(ci);
+ ci_extcon_wakeup_int(ci);
}
return 0;
>
> This patch fixes that behaviour and lets the rest of the code check if
> something has to be done. If nothing has to be done the same return
> value gets returned as before.
Before the controller leaving low power mode, otgsc value may not
correct since the controller/PHY is still in low power mode.
>
> Fixes: 1f874edcb731 ("usb: chipidea: add runtime power management support")
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
>
> ---
>
> Hi Peter
>
> During my investigation I found a bug in ci_irq. I would appreciate
> if you could review this. From what I see this patch should be save to apply.
>
> This patch does not solve all of our issues. When I have RUNTIME_PM
> enabled on imx6ull or imx7. RNDIS still does not come up. So there
> has to be another bug hiding somewhere in the Runtime PM code to prevent
> RNDIS from working properly. I quickly looked through your patches
> that added this stuff back in 2015 but couldn't spot anything related to
> usb gadget-mode.
>
> If you right away know where the problem could be hiding itself,
> I would appreciate a hint.
>
I need information for call trace for further suggestion.
Peter
>
> ---
>
> drivers/usb/chipidea/core.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 9a7c53d09ab4..5159420a23a4 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -518,7 +518,7 @@ static irqreturn_t ci_irq(int irq, void *data)
> disable_irq_nosync(irq);
> ci->wakeup_int = true;
> pm_runtime_get(ci->dev);
> - return IRQ_HANDLED;
> + ret = IRQ_HANDLED;
> }
>
> if (ci->is_otg) {
> --
> 2.27.0
>
--
Thanks,
Peter Chen
next prev parent reply other threads:[~2020-06-29 20:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-26 11:03 [PATCH] usb: chipidea: fix ci_irq for role-switching use-case Philippe Schenker
2020-06-29 7:26 ` Peter Chen [this message]
2020-06-29 10:04 ` Philippe Schenker
2020-06-30 0:43 ` Peter Chen
2020-06-30 11:59 ` Philippe Schenker
2020-07-01 2:52 ` Peter Chen
2020-07-01 8:32 ` Philippe Schenker
2020-07-01 9:02 ` Peter Chen
2020-07-01 10:52 ` Philippe Schenker
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